Non-steerable twin roll vibrating roller



April 22, 1969 H. R. COWLEY ET AL NON-STEERABLE rwm ROLL V IBRATJfNG ROLLER Sheet Filed July 6, 1967 A ri122,1'9s9' H, R; C WLEY ETAL 3,439,594

NON-STEERABLE TWIN ROLL VIBRATING ROLLER Filed July 6; 1se7 Sheet 3 of :s

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United States Patent Oflice Patented Apr. 22, 1969 US. CI. 9450 5 Claims ABSTRACT OF THE DISCLOSURE A non-steerable tandem vibratory roller in which each roll is vibrated by independent vibrators arranged concentrically in relation to a cantilever shaft on the main frame, on which shaft the roll is mounted to revolve, characterised in that drive is transmitted to each vibrator through a separate drive belt or like transmissions driven from a common power unit and that the traction drive is through a single drive chain or like transmissions to both rolls, both traction and vibrator drives being at one side or end of the rolls whereby the other side in unobstructed by any frame for the rolls.

This invention comprises a non-steerable vibratory roller and is concerned with a roller having two driven rolls arranged in tandem.

The problem of operating a roller along a kerbstone or wall does not arise in a three-wheeled roller but in a roller having a single roll or one having tandem rolls, especially in vibratory rolls, difficulties have presented themselves due to the dual drives, one for the traction and the other for the vibrator which until recently have been placed one on each side.

In US. Patent to Rowland Percy Green, No. 3,225,669, dated Dec. 28, 1965, which relates to a single driven roll, this problem has been solved utilising a cantilever suspension and arranged both the traction and vibrator drives on the side at which the cantilever is secured to the main frame, thereby leaving the other side of the roll unobstructed or clear.

To provide a clear side for both rolls in a tandem vibratory roller has not hitherto found a satisfactory solution to the several design problems which are involved and this invention has for its object to provide a tandem roller having twin non-steerable rolls, each having independent traction and vibratory drives.

According to the present invention, in a non-steerabl tandem vibratory roller in which each roll is vibrated by an independent vibrator arranged concentrically in relation to a cantilever shaft on the main frame, on which shaft the roll is mounted to revolve, drive is transmitted to each vibrator through a separate drive belt or the like driven fro-m a common power unit; and the traction drive is through a single drive chain or the like to both rolls, both traction and vibrator drives being at one side or end of the rolls whereby the other side is According to a further feature of the invention, in a non-steerable tandem vibratory roller in which each roll is vibrated by an independent vibrator arranged concentrically in relation to a cantilever shaft on the main frame, on which shaft the roll is mounted to revolve, in order to accommodate both the traction and vibrator drives on one side of the roller frame, the final drive members of which are mounted to revolve about axes and concentric with the roll axes, the cantilever shaft is mounted on a bracket or arm which is off-set axially in respect to the main frame. Preferably the bracket or arm mounting the cantilever shaft extends along the radius to the roll axes so as to provide ready access to the belt and/0r chain drives.

The invention is illustrated in the accompanynig drawings in which:

FIGURES l and 2 are respectively a side and end elevation of a vibratory roller having rolls arranged in tandem and provided with vibratory and traction drives in ac cordance with the invention, and

FIGURE 3 is a part vertical section showing the drive :to one of the rolls.

In the drawings, the rolls are indicated at R1 and R2,

these rolls being journalled to revolve at their outer ends on cantilever shafts, part of one of which is shown at C in FIGURE 2, the shafts C being secured at one end to the machine frame through brackets indicated generally at B in FIGURE 3, which brackets include arm portions 14 and, as can be seen from FIGURE '3, are offset in relation to the main frame M, FIGURE 1. Control of the roller as a whole and for the purpose of steering is by means of a handlebar H which extends to the rear, it being understood that neither of the rolls is steerable. In this invention both rolls R1 and R2 are clear-sided on one side of the roller, that is to say, they are unobstructed by parts of the frame or drive mechanism protruding beyond the ends of the rolls, the clear side being indicated by the arrow S in FIGURE 2.

Drive is from a single prime mover both to the roll shells and to their vibrators.

The traction drive to each roll shell is through a gear box indicated generally at G, FIGURE 1, on the output shaft 1 of which is fixed a sprocket 2, the drive from sprocket 2 being by means of a single chain 3 to each of 'two driven sprockets 4, 4, mounted to rotate on a bearing carried by a member 36 hereinafter described, the sprockets being coupled directly to each of the roll shells through trailing link couplings indicated generally at 42 in FIGURE 3, these being two pairs of links, the links in each pair being diametrically opposed in accordance with the arrangement shown in US. Patent to Harold Raymond Cowley No. 3,195,429, dated July 20, 1965.

The prime mover and gear box are supported by transverse struts 5 (see FIGURE 1) attached to the outside ends of which are side plates 6, 6'. Secured to the side plate 6 on the drive side, as distinct from the clear side, which is the right side of the figure in FIGURE 2, are angle section spacer bars, of which there are three to each roll mounting, indicated respectively at 7, 8, 9 and 7', 8, 9', the bar 7 of the one roll mounting extending horizontally and the bar 8 vertically, the third bar 9 being arranged along the outer edge of the plate 6. The corresponding bar 7 of the other roll is at an angle to the horizontal so as not to interfere with the downrun of the chain 3 from the chain tensioner 43 to the rear roll.

I As can be seen from FIGURE 3, the horizontal flange or the spacer bar 7 projects laterally from the side plate 6, and is welded to a bridge plate 11. The other spacer bars; similarly project laterally and have their flanges welded to the respectively associated bridge plates, each of which is formed with an aperture 12 in which are secured the respective bracket arms B.

Each bracket includes a substantially rectangular plate 15 formed with a spigot 13 to fit the aperture, the plate 15 constituting a hold down flange secured by screw studs 17 to the bridge plate 11. It will be seen that arm 14 proper is axially off-set in relation to the roll shell and thus from the bridge plate 11. The arm extends downwardly along a radius to the roll axis in front of the belt drives indicated at 21, 22, by which the vibratory shafts are driven. The ends of the arms are formed with bores in which the cantilever shafts C are secured by welds.

As can be seen from FIGURE 3, the bridge plate 11 is axially off-set, i.e. spaced from the main frame side plate 6 at a distance suflicient to provide clearance space for the drive chain 3 and driven sprockets 4 and likewise the bracket arms 14 are in turn axially off-set to provide space to accommodate the vibrator drive belts 21, 22 and their associated pulleys so that it is a simple matter to effect adjustments, repair or replace the respective drive chains or belts which can be done without having to strip down machine parts apart from chain guards. Openings 46 are provided in the bridge plates 11 through which the cantilever spindle C and the vibrator shaft projects.

The vibratory drives to the rolls are from a twin pulley on the gear box output shaft (not shown) by means of belts 21 and 22 respectively to driven pulleys 25 and 24 fixed on the vibrator shafts of their respective rolls, one of which shafts is shown at 27 in FIGURE 3, the operation and construction being similar to the arrangement described in the aforementioned US. Patent No. 3,225,669.

As in the prior arrangement, the roll shell R2 has standard inset end plates P (FIGURE 3) secured by bolts to the flanges 29 of a central two part housing 28 within which the vibrator shaft 27 is journalled by a ball bearing 31.

The outermost part 30 of the housing 28 is formed with an axial flange providing a stub axle 32 extending within and being rotatably mounted by a flanged collar component 33 of a rubber-in-shear mounting 34, the other component being indicated at 35. The outer component 35 of the flexible mounting is attached to the flange of a bearing support ring 36 which in turn is attached to the bridge plate 11 by studs A1.

As can be seen from FIGURE 3, the driven sprocket 4 revolves about a bearing on the part 36 and is formed with a flange 37 having two off-set spider arms 38 by which drive is transmitted through driving pins 40 including the trailing links 42 to the roll shell end plate. A tensioner sprocket 43' is provided for adjusting the running tension of the chain 3. Similar tensioner pulleys 44, 44, serve to tension the vibrator belt drives 22, 21.

It will be understood that the drive to each vibrator shaft may be transmitted either through a belt or a chain incorporating a tensioner.

What is claimed is:

1. A non-steerable tandom vibratory roller comprising a main frame including, at one side of said roller, a side frame portion having two roll elements arranged in tan dem, mounting brackets on the side frame portion, each bracket having an arm which is offset axially in relation to the side frame portion to provide clearance space, cantilever shafts each attached at one end to the associated bracket arm and at its other end being free, vibratory means including tubular out-of-balance shafts through which the cantilever shafts respectively extend, said out-of-balance shafts respectively projecting at said one end of each beyond the side frame portion, roll elements mounted to revolve about said out-of-balance shafts, a common power unit on the main frame, vibrator drive transmission means including driving and driven members, said driven members being fast on the projecting ends of the out-of-balance shaft associated with each of said roll elements and accommodated in the clearance space between the associated bracket arm and the side frame portion, traction drive means for each of said roll elements for transmitting drive from the power unit, said traction drive means being accommodated between the side frame portion and the bridge plate whereby the other side of the roller remains unobstructed.

2. A non-steerable tandem vibratory roller comprising a main frame including a side frame portion and having two roll elements arranged in tandem, a bridge plate, spacing bars by which the bridge plate is attached to the side frame portion, suspension brackets for each roll element attached to the bridge plate, each bracket having an arm which is offset axially, cantilever shafts attached at one end to the bracket arms and their other ends being free, vibratory means including a tubular out-of-balance shaft through which the cantilever shaft extends, said out-ofbalance shafts extending beyond the side frame portion, the roll elements being mounted to revolve about said out-of-balance shafts, a common power unit on the main frame, vibrator drive transmission means including driving and driven members, each of said driven members being fast on the extension of the out-of-balance shaft of each of said roll elements and accommodated in the space between the bracket arm and the side frame portion, traction drive means for each of said roll elements including driven sprockets mounted concentrically with respect to each vibrator shaft and a single endless drive chain for transmitting drive from the power unit to said sprockets, said sprockets and said chain being accommodated between the side frame portion and the bridge plate whereby the other side of the roller remains unobstructed.

3. A roller as claimed in claim 2 in which each bracket arm is secured to a seating on the bridge plate, the bridge plate having an aperture through which the cantilever shaft extends.

4. A roller as claimed in claim 2 in which each roll element is secured to a bearing housing formed with a stub axle which is rotatably mounted in a resilient bearing supported from the bridge plate.

5. A roller as claimed in claim 4 in which the resilient bearing comprises two components connected by shear blocks, one component being attached to the bridge plate by a collar on which the final drive sprocket or other member is mounted to revolve.

References Cited UNITED STATES PATENTS 2,873,656 2/1959 Andersson 9450 2,925,759 2/1960 HilliS 94-50 3,038,350 6/1962 Meyer 9450 X 3,048,089 8/1962 Kaltenegger 94-50 3,105,424 10/1963 Dion 9450 3,192,839 7/1965 Vivier 9450 3,225,669 12/1965 Green 94-50 3,267,825 8/1966 Owen 94-50 3,339,468 9/1967 Hall 94-50 NILE C. BYERS, JR., Primary Examiner. 

